Obviously the amount of energy required for cell duplication with a large genome is so small that it doesn't amount to a selection pressure. Perhaps there is an upper limit but evenonions with their gigantic genomes ten times as large as humans haven't reached it yet.
That could be it.
I was thinking that with DNA being 250g of the body weight and a hand weighting between 250g - 500g the impact would be big enough, but you might be right.
How would a mechanism work that could distinguish between useful and DNA and random copying errors?
Natural selection? The individuals with "random copying errors" die and the once "with useful and DNA" procreate. But as you said, maybe the selective pressure is to smal.
Your quote doesn't show that. What criteria?
I was referring to: 1 useless piece sucking energy. 2 random changes within DNA naturally accruing.
In my mind that is all that is needed for change.
A new aspect I just thought of:
If we have varying amounts of "bloat code" within different species, would that not indicate that something is going on? With billions more or less of the base pairs, if all code was copied all the time, would not all species living now have billions of base pairs? Also, the more something has evolved, would that not indicate more "bloat code" in a human than say a trilobite and so on?